Since I'm not familiar with 'oda na bunga' specifically, it's difficult to define what this fanfiction is about. It could be a niche piece of fanfiction within a particular fandom. The 'oc' part implies that it might involve characters created by the fanfic writer rather than just using the existing characters from the source material related to 'oda na bunga'. It could cover a wide range of themes, from adventure to romance, depending on the writer's intention.
The Laila Majnu story is more of a romantic legend passed down through generations. While it might have been inspired by real people or experiences, it's difficult to say if it's completely true in a factual sense.
It's hard to say for sure if it's completely real. Laila and Majnu's story has been passed down through generations, and it could be a combination of real experiences and creative imagination.